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Maintenance And Troubleshooting - Siemens GMSG-GCB Instruction Manual

5 kv to 15 kv vacuum circuit breakers

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Maintenance and
troubleshooting
Sub-assembly
Primary power path
Vacuum interrupter operator mechanism
Electrical controls
High-potential test
Insulation
Item
Vacuum interrupter
Primary disconnects
Vacuum interrupter contact resistance
Cleanliness
Fasteners
Manual-spring check
Lubrication
Wiring
Terminals and connectors
Close and trip solenoids, anti-pump relay,
auxiliary switches and secondary disconnect
Primary circuit-to-ground and between
primary disconnects
Control circuit-to-ground
Barrier and all insulating components
Table 7: Periodic maintenance and lubrication tasks
Inspect for
1. Cleanliness.
2. Contact erosion.
Note: Perform with manual-spring checks.
3. Vacuum integrity.
Note: Perform with high-potential tests.
1. Burnt or damaged fingers.
2. Lubrication of contact surfaces.
1. Record contact resistance with contacts closed
and check at each maintenance interval to
monitor condition.
1. Dirt or foreign material.
1. Tightness of nuts and other locking devices.
1. Smooth operation of manual charging, manual
closing and manual tripping.
1. Evidence of excessive wear.
2. Lubricaion of wear points.
1. Mechanical damage or abrasion.
1. Tightness and absence of mechanical damage.
1. Automatic charging.
2. Close and trip with control power.
1. 60-second withstand 14 kV or 27 kV or 28.5 kV,
60 Hz (20 kV or 38 kV or
40 kV dc).
1. 60-second withstand 1.5 kV, 60 Hz.
1. Cleanliness.
2. Cracking, crazing, tracking or other sign of
deterioration.
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